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<p>Uranyl (UO₂<sup>2</sup>⁺) contamination in water presents significant environmental and health risks due to its radioactivity and chemical toxicity, underscoring the need for sustainable, eco-friendly extraction methods. This study investigates a green approach for uranyl recovery using cloud point extraction (CPE) with Triton X-114 combined with biodegradable amino acids (AAs). The extraction parameters were adjusted using Box–Behnken Design (BBD) and Response Surface Methodology (RSM), evaluating the effects of AA concentration (12.5–17.5 mmol/L), surfactant concentration (10–16 wt.%), and temperature (46–52 °C). The responses assessed included coacervate volume fraction (Φc), residual uranyl concentration (Xm,w), surfactant loss (Xt,w), and overall extraction efficiency (Y). Results showed that the Triton X-114/tryptophan system achieved up to 84% uranyl removal at optimal conditions (17.5 mmol/L tryptophan, 10 wt.% surfactant, 49 °C), while the Triton X-114/alanine system reached 78% efficiency (15 mmol/L alanine, 16 wt.% surfactant, 52 °C). Extraction efficiency was strongly pH-dependent, with maximum yields observed between pH 3.5–6. Regression analysis (R<sup>2</sup> &gt; 0.98) confirmed the robustness of the developed models, identifying surfactant concentration and temperature as key influencing factors. This study concludes that biodegradable amino acids effectively enhance CPE performance, providing a sustainable, efficient, and scalable method for uranyl removal. The proposed system offers a viable green alternative to traditional solvent-based extraction methods for uranium-contaminated water remediation.</p> Graphical abstract <p></p>

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Efficient recovery of uranyl ion from aqueous solutions via cloud point extraction with triton x-114 and biodegradable amino acid systems

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Mohammed Kasmi,
  • Benderrag abdelkader,
  • Boumediene Haddou,
  • M. Naushad,
  • Asmaa Benettayeb,
  • Mortada Daaou,
  • Ulrich Maschke

摘要

Uranyl (UO₂2⁺) contamination in water presents significant environmental and health risks due to its radioactivity and chemical toxicity, underscoring the need for sustainable, eco-friendly extraction methods. This study investigates a green approach for uranyl recovery using cloud point extraction (CPE) with Triton X-114 combined with biodegradable amino acids (AAs). The extraction parameters were adjusted using Box–Behnken Design (BBD) and Response Surface Methodology (RSM), evaluating the effects of AA concentration (12.5–17.5 mmol/L), surfactant concentration (10–16 wt.%), and temperature (46–52 °C). The responses assessed included coacervate volume fraction (Φc), residual uranyl concentration (Xm,w), surfactant loss (Xt,w), and overall extraction efficiency (Y). Results showed that the Triton X-114/tryptophan system achieved up to 84% uranyl removal at optimal conditions (17.5 mmol/L tryptophan, 10 wt.% surfactant, 49 °C), while the Triton X-114/alanine system reached 78% efficiency (15 mmol/L alanine, 16 wt.% surfactant, 52 °C). Extraction efficiency was strongly pH-dependent, with maximum yields observed between pH 3.5–6. Regression analysis (R2 > 0.98) confirmed the robustness of the developed models, identifying surfactant concentration and temperature as key influencing factors. This study concludes that biodegradable amino acids effectively enhance CPE performance, providing a sustainable, efficient, and scalable method for uranyl removal. The proposed system offers a viable green alternative to traditional solvent-based extraction methods for uranium-contaminated water remediation.

Graphical abstract